Furnace



June 17, 1924. 1,498.125

- L. D. SLADE FURNACE Filed Anril 5, 1922 l J g 116 319 ATTORNEY Patented June 12,

UNITED s'ra'nzs PATENT OFFEE.

I LEON D. BLADE, OF ROCHESTER, NEW YORK, ABSIGNOR TO GLEASON WORKS, OF

ROCHESTER, NEW YORK, A COBEORATION OF NEW YQRK.

FURNACE.

' F Application filed April 5,1822. Serial No. 549,706.

To all whom it may concern:

Be it known that LIJEON D. Smon, a citizen of the United States of America, residing at Rochester, in the county of Mon- 5 roe and State of New York, have invented certain new and useful Improvements in Furnaces, of which the following is a specification.

My invention relates to furnaces of the general type in which articles to be treated are fed throu h from one end to the other during a heath heat treating rocess, and it has for its purpose to aflor a practical and efiicient sup- 1 sort or feeding mechanism for the articles uring the heat treatment.

More particularly, the invention has for its object toprovide a conyeyor in the form of rotating rolls, and so constructedas to successfully withstand high temperatures of from 1000 to 1900 Fahrenheit such as are present in electric heat treating furnaces.

. A further purpose of the invention is to afford roll feeding mechanism ca able of 26 supporting 'and carrying relative y small articles, and which can be subjected to temperatures of any desired degree without damagin 'or seriously afiecting the feeding rolls, an further in providing for the re- 30 lacement of an one of the feeding rolls independently o the others.

To these ends, the invention com rises the arran ement set' forth in the ollowing speci cation which will be clearly understood in comunction with the accompanying drawin the novel features being pointe out in t e claims following the description.

In the drawing: Figure 1 is a transverse vertical sectional 40 view illustrating a practical embodiment of the invention;

Figure 2 is a side elevation with parts broken away, and Y Fi ure 3 is a longitudinal vertical sec tiona view with parts broken away.

In the construction illustrated, A designates a heating chamber preferabl of reduced width at the bottom to afl'o a runway B, while C desi ate electrical heating elements disposed at e up r or wider portion of the heating cham r and between the sides thereof and the sides o'fthe runway B. This arrangement protects the ardening, annealing, or otherheating elements and prevents their being broken or struck by the articles under treatment as they travel through the furnace in the runway B, although the heating elements may be located at the top of the furnace or otherwise positioned out of the path of the articles traveling through, at

The articles under treatment are fed through the chamber by a conveyor comprisin a series of rolls D, arranged horizontal y in the runway B and preferably slightly above the bottom thereof. The rolls D are of relatively small diameter, ordinarily about an inchand a-half, and arranged in relatively close relation to each other, ordinarily at a distance of about two inches between the rolls, so as to make it possibleto support relatively small articles, and carry them through the furnace without the possibility of their falling between thefeedmg rolls.

To accom lish this result, I preferably em loy soli rolls, made froma metal that wil withstand the maximum working heat" of a furnace without buckling, becoming distorted, or wasting away, so as to requirev frequent renewal. One metal which has been found satisfactory for this purpose is thermalloy, a composition containing aproximately iron and 20% chromium. ther metals which can be used successfully for making the rolls are chromel, containing approximately 75% nickel and 25% chromium, nichrome, containing approximately 60% nickel, 20 0 chromium and 20% iron, or an alloys 0 chromium or nickel. With an al 0 such as above mentioned, the rolls D can made of very small diameter, and will maintain their original form and condition under temperatures up to about -1900 F. Thus, the entire heating chamber can be maintained at a uniform temperature, and there are no heat losses due to having to cool or protect the feeding rolls The rolls are of substantially the same diameter, and each roll is preferablyof uniform diameter throughout its length to facilitate removing any particularro independently of the others, they be' removable endwise from the furnace. e rolls me. be driven b any suitable mechanism, an in the em iment shown, each roll carlot rise at its outer end a worm gear E located outside the furnace,'and engaged by a worm of the rolls, or the quality which permits their being exposed to hi h temperatures Without becoming distorte wastin or otherwise changing their'originafi form. The-invention is not limited to electricfurnaces, or to the precise arrangement set forth in the present disclosure, and this ap- I plication is intended to cover any modifications or departures involving the utilization of feeding rolls made of heat resisting material, or coming within the terms of the following claims. i

I claim: 1. In a furnace adapted for'working temperatures of approximatel 11000 to 1900 the combination with a eating chamber, of a conveyor compnsm a series of rotating rolls formed of a c romium alloy arranged transversely in said chamber, and

means for rotating the rolls.

2. In a' furnace adapted for working temperatures of approximately 1000 to 1900 the combination with a heating chamber, of a conveyor-comprising a. series of rolls of heat resisting material such as a chromium alloy arranged ,transversely in said chamber, and means for rotating the rolls.

3. In a furnace adapted for working temp eratures of approximately 1000 to 1900 the combination with a heating chain ber, of a conveyor comprising a series of.

solid rolls formed of a material capable of resisting working temperatures of approxiaway,

mately 1000 to 1900 F. without distortion and arranged transversely in said chamber,

-F., the combination with a heating chamber, of a conveyor comprisinga series of rolls of heat resisting material such as a chromium} alloy arranged transversely in said chamber, said rolls being of relatively small diameter and arranged in close proximity-to each other so as to convey small articles, and means for rotating the rolls.

5. In a furnace adapted for working temperatures of approximately 1000 to 1900 the combination with a heating chamber, of a conveyor comprising a series of solid rolls of heat resisting material such as a chromium alloy arran ed transversely in said chamber, said rolls ing of relatively small diameter and arranged in close proximity to each other so as to convey small articles, and means for rotating the rolls.

6. In a furnace adapted for working temperatures of approximately 10007 to 1900 F., the combination with a heating. chamber of reduced width 'near the bottom to form a runway, electric heating elementssi edm name.

gn LEON 1). SLADE. 

